Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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dampening

Configure dampening on an interface.

Syntax

dampening [[[[ half-life] [ reuse-threshold]] [ suppress-threshold]] [ max-suppress-time]]

To disable dampening, use the no dampening [[[[ half-life] [ reuse-threshold]] [ suppress-threshold]] [ max-suppress-time]] command.

Parameters

half-life	Enter the number of seconds after which the penalty is decreased. The penalty decreases half after the half-life period expires. The range is from 1 to 30 seconds. The default is 5 seconds.
reuse-threshold	Enter a number as the reuse threshold, the penalty value below which the interface state is changed to “up”. The range is from 1 to 20000. The default is 750.
suppress-threshold	Enter a number as the suppress threshold, the penalty value above which the interface state is changed to “error disabled”. The range is from 1 to 20000. The default is 2500.
max-suppress-time	Enter the maximum number for which a route can be suppressed. The default is four times the half-life value. The range is from 1 to 86400. The default is 20 seconds.

Defaults

Disabled.

Command Modes

INTERFACE (conf-if-)

Supported Modes

Full–Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
9.2(0.0)	Introduced on the M I/O Aggregator.
8.3.16.1	Introduced on the MXL 10/40GbE Switch IO Module.

Usage Information

With each flap, the Dell Networking OS penalizes the interface by assigning a penalty (1024) that decays exponentially depending on the configured half-life. After the accumulated penalty exceeds the suppress threshold value, the interface moves to the Error-Disabled state. This interface state is deemed as “down” by all static/dynamic Layer 2 and Layer 3 protocols. The penalty is exponentially decayed based on the half-life timer. After the penalty decays below the reuse threshold, the interface enables. The configured parameters are as follows:

suppress-threshold should be greater than reuse-threshold
max-suppress-time should be at least 4 times half-life

NOTE: You cannot apply dampening on an interface that is monitoring traffic for other interfaces.

Example

Dell(conf-if-te-3/2)#dampening 20 800 4500 120
                                             Dell(conf-if-te-3/2)#

Related Commands

clear dampening — clears the dampening counters on all the interfaces or just the specified interface.

show interfaces dampening — displays interface dampening information.